[pulseaudio-discuss] [PATCH] alsa: reset watermark to initial values on resume

[Pierre-Louis Bossart]

> If the RT prio stuff is working the way it should, there shouldn't be
> underruns (on the Pulse/ALSA side, not the client side) even if the
> system load is high.

I have never seen any issues when the processing is done inside the
real-time thread (voice integration in Meego). 
The issue is that the main thread and the client aren't real-time, and they
may not be able to provide data fast enough. Try with pa_cat -v
--latency-time-ms=1 and you will see the latency increase due to underflows
and changes in buffer sizes.